The remains of the Stegeborg castle are situated beautifully on a little island in the sea channel leading toward Söderköping. In the Middle Ages the castle was one of the most important strongholds in Sweden and also a royal palace. The oldest parts of the castle is a brick tower in the southeast corner, built in the early 13th century.
In the 18th century the castle was in bad shape and some wooden buildings were even were auctioned off. In 1938 the Swedish National Heritage Board received a small sum to clear the location of trees and repair the worst damage and raise protective roofing over certain parts. The new main building (a private residence) was completed in 1806. The herb-garden was laid out in 1988 by the present owner.
Today Stegeborg is open for tourists and the castle ruins are now also a port tavern and a marina.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.